The 12-time Grammy Award winner arrived at MetLife Stadium in New Jersey about 40 minutes before kick-off to watch Travis Kelce - to whom she has been romantically linked - and his Kansas City Chiefs defeat the New York Jets 23-20.
A video of Swift entering the stadium's security area with her fellow celebrities on Sunday night was posted online.
US television coverage of the game cut to Swift on numerous occasions, including a shot of the pop superstar with her arm around Kelce's mother, Donna, who was wearing her son's No.87 jersey.
Swift's appearance comes a week after she was at Arrowhead Stadium - decked out in red and white - to watch the Chiefs' 41-10 win over the Chicago Bears at home in a suite alongside Donna Kelce.
Swift is on a break from her Eras tour, which resumes on November 9 in Buenos Aires, Argentina.
MetLife Stadium is a familiar spot for Swift, who performed three sold-out concerts there in May.Â
Neither Swift nor Kelce have revealed any details about their relationship. Kelce said on a podcast earlier this week that Swift "looked amazing" at the game.
"Everybody was talking about her and in a great light," Kelce said of her time spent in the suite. "And on top of that, you know, the day went perfect for Chiefs fans. Of course, we script it all, ladies and gentlemen."
Kelce had invited Swift to that game after trying - and failing - to give her a friendship bracelet when her Eras tour made its stop in Kansas City.
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